Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Statutory income tax amount	$ 3,912	$ 1,890	$ 1,567
State taxes, net of federal benefits	85	319	392
Transaction costs	2	60	143
Employee stock purchase plan	98	79	127
Foreign operations	1,552	556	431
Non-deductible executive compensation	291	150	115
Change in valuation allowance	0	(2,187)	173
Utilization of research and development tax credits	(2,780)	(3,116)	(2,881)
Deferred balance sheet remeasure	0	(952)	0
ASU 2016-09 excess stock compensation	(2,967)	(1,131)	(673)
Contingent consideration	(1,239)	1,212	(27)
Changes from provision to return	413	(458)	(111)
Adjustment of tax contingency reserves	417	329	151
U.S. deduction for foreign export sales	(584)	(630)	(355)
Global intangible low-taxed income	0	33	31
Other, net	45	178	(31)
Income tax (benefit) expense	(755)	(1,367)	(948)
Effective Income Tax Rate Reconciliation, Capital Loss Expiration	$ 0	$ 2,301	$ 0